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Nirvana frontman Kurt Cobain. (AP Photo)

This photo taken on April 1, 2014 shows the house in Seattle, Washington, where Nirvana frontman Kurt Cobain committed suicide Nirvana fans prepare to mark the 20th anniversary of Cobain's suicide on April 5. (Michael THURSTON/AFP/Getty Images)

This April 1994 photo provided by the Seattle Police Department shows items found at the scene of Kurt Cobain's suicide, in Seattle. The image has never before been released. Police spokeswoman Renee Witt said Thursday, March 20, 2014, that several rolls of undeveloped film were found when a detective re-examined the Cobain case recently. (AP Photo/Seattle Police Department)

An undated file photo shows "Nirvana" lead singer and guitarist Kurt Cobain performing on stage. Living fast and dying young has long been part of rock 'n' roll lore. And in this case, statistics affirm the image, according to a study released Tuesday, Sept. 4, 2007. Researchers at Liverpool John Moores University, whose report appeared in the Journal of Epidemiology and Community Health, studied a sample of North American and British rock and pop stars and concluded they are more than twice as likely as the rest of the population to die an early death. The team analyzed the stars of rock, punk, rap, R&B, electronic and new age genres in the "All Time Top 1,000" albums, published in 2000. They then analyzed the artists - ranging from the late Elvis Presley to the still lively rapper Eminem tabulating how many had died and at what age. Cobain committed suicide at his home in Seattle on April 8, 1994. (AP Photo)

A sign in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

This April 1994 photo provided by the Seattle Police Department shows items found at the scene of Kurt Cobain's suicide, in Seattle. The image has never before been released. Police spokeswoman Renee Witt said Thursday, March 20, 2014, that several rolls of undeveloped film were found when a detective re-examined the Cobain case recently. (AP Photo/Seattle Police Department)

Kurt Cobain lives on in a DVD. (AP Photo/Sam Morris)

The welcome sign to Aberdeen, Washington, is seen on April 1, 2014 along with the title of a Nirvana song. Nirvana fans prepare to mark the 20th anniversary of the band's frontman Kurt Cobain's suicide on April 5. (Michael THURSTON/AFP/Getty Images)

Members of the band Nirvana shown in a 1991 file photo are (from left) Krist Novoselic, David Grohl, and Kurt Cobain. Novoselic recently sat down with former (Aberdeen) Daily World Publisher and Editor John Hughes for an oral history, which was released Feb. 24, 2009 by the Washington secretary of state's Legacy Project. Novoselic said fans should not expect any more Nirvana songs to be released. (AP Photo/Chris Cuffaro, File)

A sign in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

Lead singer of Nirvana Kurt Cobain is shown in a 1993 file photo. Cobain, who raked in a posthumous $50 million between October 2005 and October of this year, has edged Elvis Presley from the No. 1 spot on Forbes magazine's annual list of "Top-Earning Dead Celebrities." He committed suicide in 1994.(AP Photo/Mark J.Terrill)

Graffiti seen under a bridge in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park and bridge where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

Singer Courtney Love and her daughter Frances Bean Cobain pose as they arrive, Thursday, Feb. 8, 2007, in Beverly Hills, Calif. where the City of Beverly Hills and the Rodeo Drive Committee honored Gianni Versace and his sister Donatella Versace for their contributions to the worlds of fashion and entertainment with the Rodeo Drive Walk of Style Award. Versace, founded in 1978 by Gianni Versace, is one of the leading international fashion design houses and a symbol of Italian luxury worldwide. (AP Photo/Mark J. Terrill)

The family home of musician Kurt Cobain is seen in Aberdeen, Washington on April 1, 2014. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

A memorial plaque sits in the ground at Kurt Cobain Riverfront Park in Aberdeen, Wash. on Friday, Aug. 7, 2009. The granite plaque stirred controversy because of an obscenity in a quote by Cobain etched into the memorial. The last three letters of the word were removed Thursday and replaced with dashes before the Aberdeen City Council could weigh in on the issue. (AP Photo/The Daily World, Dan Jackson)

A Nirvana Ovation acoustic guitar played by Kurt Cobain is displayed at the launch of Hard Rock International's traveling music memorabilia collection, "Gone Too Soon," Wednesday, Feb. 13, 2013, at Hard Rock Cafe New York. "Gone Too Soon" pays tribute to music icons whose lives and career where tragically cut short and will be on tour at Hard Rock locations in the U.S. throughout 2013. (Photo by Diane Bondareff/Invision for Hard Rock International/AP Images)

City of Aberdeen, Wash., workers level ground on the site of a new park along the banks of the Wishkah River near the Young Street Bridge. Tory Kovach and Denny Jackson are building a park there in memory of Kurt Cobain. The Young Street Bridge has turned into an unofficial memorial to the Aberdeen grunge rock star since his suicide in 1994.(AP Photo/The Daily World, Dan Jackson)

A painting by late Nirvana frontman Kurt Cobain in Tacoma, Wash. (AP Photo)

Graffiti seen on a bench in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The bench and park, where Cobain used to hang out, have become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

A painting by late Nirvana frontman Kurt Cobain is shown in Tacoma, Wash. (AP Photo)

Gillian Gaar, author the book " The Rise of Nirvana" sits on a bench in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014, adjacent to the house where Cobain lived(background). The bench has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

A painting by late Nirvana frontman Kurt Cobain is shown in Tacoma, Wash. (AP Photo)

This undated photo provided by Kim Cobain, Kurt Cobain's sister, shows a young Kurt Cobain, left, and Kim in their childhood home in Aberdeen, Wash. Cobain's mother, Wendy O'Connor, is putting the 1.5-story bungalow _ which is assessed at less than $67,000 _ on the market for $500,000. But she'd also be happy entering into a partnership with anyone who wants to turn it into a museum. (AP Photo/Courtesy Kim Cobain)

A painting by late Nirvana frontman Kurt Cobain is shown in Tacoma, Wash. (AP Photo)

A painting by late Nirvana frontman Kurt Cobain was done on the back of a board game that Cobain bought at thrift store because he was too poor to afford canvas, is seen April 1, 2004, in Tacoma, Wash. The crease from the folding board is clearly visible across the center of the painting. (AP Photo)

A sign in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The park where Cobain used to hang out and write songs has become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

This undated photo provided by Kim Cobain, Kurt Cobain's sister, shows a young Kurt Cobain, left, and Kim in their childhood home in Aberdeen, Wash. Cobain's mother, Wendy O'Connor, is putting the 1.5-story bungalow _ which is assessed at less than $67,000 _ on the market for $500,000. But she'd also be happy entering into a partnership with anyone who wants to turn it into a museum. (AP Photo/Courtesy Kim Cobain)

The family home of musician Kurt Cobain is seen in Aberdeen, Washington on April 1, 2014. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)

Graffiti etched in a bench in Kurt Cobain Park in Aberdeen, Washington on April 1, 2014. The bench and park, where Cobain used to hang out, have become a symbol for fans as it was a gathering place after the news of his death spread. Nirvana fans prepare to mark the 20th anniversary of the iconic frontmans suicide on April 5. (Sebastian VUAGNAT/AFP/Getty Images)